Moss-Erwinia pathosystem reveals possible similarities in pathogenesis and pathogen defense in vascular and nonvascular plants |
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| Authors: | Robert A Andersson Motomu Akita Minna Pirhonen Elin Gammelgård Jari PT Valkonen |
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| Institution: | (1) Department of Plant Biology, Swedish University of Agricultural Sciences (SLU), Genetics Centre, Uppsala, Sweden;(2) Department of Applied Biology, University of Helsinki, PO Box 27, FIN-00014 Helsinki, Finland;(3) Present address: Department of Biotechnological Science, Kinki University, Wakayama, Japan |
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| Abstract: | Vascular plants have various inducible resistance mechanisms as defense against pathogens. Mosses, small nonvascular plants (subkingdom Bryophyta), have been little studied in regard to their pathogens or modes of defense. Data here show that Erwinia carotovora, a bacterial plant pathogen that causes softrot in many dicotyledonous plants, can also cause soft rot symptoms in the moss Physcomitrella patens. Infection of moss by E. carotovora required pathogenicity factors similar to those required to infect vascular plants and, again as in vascular plants, salicylic acid (SA) induced moss to inhibit tissue maceration by Erwinia. These data reveal that SA-dependent defense pathways may have evolved before differentiation of vascular and nonvascular plants. |
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| Keywords: | Physcomitrella patens Moss Erwinia carotovora Disease resistance Salicylic acid Pathogenesis-related protein PR-1 |
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